iOS筆記之檔案讀寫

標籤：

最近做的項目中要儲存一組圖片資料，圖片帶有name，date等屬性，處理辦法是講image圖片直接存在沙箱documents檔案中，再使用plist檔案儲存體圖片屬性和image路徑。

存入圖片：

- (void)savePhotos:(NSArray *)photos {        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);    NSString *plistPath = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"photo_info.plist"];    NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"Image"];    NSLog(@"%@", filePath);        NSFileManager* fileManager = [NSFileManager defaultManager];    if (![fileManager fileExistsAtPath:plistPath]) {        [fileManager createFileAtPath:plistPath contents:nil attributes:nil];    }    if (![fileManager fileExistsAtPath:filePath]) {        [fileManager createDirectoryAtPath:filePath withIntermediateDirectories:NO attributes:nil error:nil];    }    NSMutableArray *savePhotos = [[NSMutableArray alloc] init];        for (Photo *photo in photos) {        NSMutableDictionary *info = [[NSMutableDictionary alloc]init];        NSString *imagePath = [filePath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.jpg", photo.name]];        [UIImagePNGRepresentation(photo.image)writeToFile:imagePath atomically:YES];        [info setObject:imagePath forKey:@"ImagePath"];        [info setObject:photo.name forKey:@"Name"];        [info setObject:photo.tags forKey:@"Tags"];        [info setObject:photo.date forKey:@"Date"];                [savePhotos addObject:info];    }    [savePhotos writeToFile:plistPath atomically:YES];}

 

讀取圖片：

- (NSArray *)loadPhotosFromDisk {    //從本地讀取圖片    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);    NSString *plistPath = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"photo_info.plist"];    NSArray *photosArr = [NSArray arrayWithContentsOfFile:plistPath];    for (NSDictionary *dic in photosArr) {        Photo *photo = [[Photo alloc] init];        photo.image = [UIImage imageWithContentsOfFile:[dic valueForKey:@"ImagePath"]];        photo.name = [dic valueForKey:@"Name"];        photo.tags = [dic valueForKey:@"Tags"];        photo.date = [dic valueForKey:@"Date"];        [self.photos addObject:photo];    }        return self.photos;}

 

iOS筆記之檔案讀寫